Each election cycle, race ratings are an integral part of the discussion about the fight for the House and Senate majorities. But where did they come from and how do they work? Elections analyst Nathan L. Gonzales goes behind the scenes to take a look at what does, and does not, go into rating a race. And he manages to weave in some Swedish metal.

After nearly two years of analyzing data and polling trends from hundreds of races, Roll Call’s elections analyst thinks he has a pretty good sense of where things could go on November 6th and beyond, but after the 2016 election it’s impossible to rule anything out.

After two years of analyzing and prognosticating, it's finally almost here: Nov. 6, Election Day. Roll Call elections analyst Nathan L. Gonzales takes you through where the House and Senate battlegrounds have landed with a video debrief on the most recent ratings changes, listed in full here:

With so many close races in the ever-changing 2018 landscape, Roll Call elections analyst Nathan Gonzales has one big question: how long after Election Day will the nation have to wait before knowing which party will control Congress? Watch the video for Gonzales’ analysis, plus a debrief on a handful of ratings changes less than three weeks out, which are listed in full below.